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Originally Posted by dinfire
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Added a video by "Chris Fix" to complement those added by dinfire.
He took a before and after scope of a 2008 Honda Civic Si engine and it very clearly was cleaner after the treatment.
In another video, he scoped and had before and after with several other products, including Techron. He saw no to very, very, very minimal benefit with any product, some appeared to be worse. The only one that worked was seafoam.
He used the aerosol version through the throttle body. I have never used Seafoam but I did buy a couple aerosol cans, I may do the brake booster method and use the cans on another vehicle.
https://www.youtube.com/watch?v=u6UeJXkzDW8&t